AP Multiple Choice 2004 answers. 1. 72%For which of the following motions of an object must the acceleration always be zero? I. Any motion in a straight line II. Simple harmonic motion III. Any motion in a circle a. I only b. II only c. III only
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AP Multiple Choice 2004 answers
A horizontal, uniform board of weight 125 N and length 4 m is supported by vertical chains at each end. A person weighing 500 N is sitting on the board. The tension in the right chain is 250 N.
61.69% Which of the following vectors could represent the velocity of the object at the end of 3 s, assuming the scales on the x and y axes are equal.
AP Multiple Choice Answers 2004
Remember: Multiple Choice is Not Multiple Guess, Work out the answers
U = Q + W
Work done = area under the curve
Only the change in internal energy is the same
Electric field is zero throughout a sphere, all electric charge is on the surface and the forces are in equilibrium, the sphere is at equipotential.
The charge on each capacitor depends on its capacitance, but the potential difference across each is the same.
ER = ((KQ/d2)2 + (KQ/d2)2) = (2(KQ/d2 )2) = 2 (KQ/d2)
E = KQ/d2
E = KQ/d2
Lplate/ Lhole = L0 plate/ L0hole
1.01/ Lhole = 1.00/ 0.1
Lhole = 1.01 x 0.1/1.00
F + 250 N = 500 N + 125 N
F = 625 – 250 N = 375 N
Taking Torques about the left end
500 x d + 125 x 2 = 250 x 4
500d = 1000 – 250
D = 750/500 = 1.5 m
Intensity P/A (W/m)
30 N Cos 60. = 15 N
F net = 5 N
a =F/m = 5 N/ 10 kg = 0.5 m/s2
potential difference = 8.0 V
P 0.01 m
P is quarter way up so potential is quarter way up = 4.0 V
Magnetic field B from wire going into page (Use right hand thumb rule)
Loop 2 is not changing magnetic field so no induced current emf = BA/t
Loop 1 is going in direction of reduced magnetic field so direction of induced current will be such as to oppose the change causing it. So needs more magnetic field into the page – clockwise using right hand thumb rule
No Phase reversal
If thickness is equal to λ/4 then waves will be back in phase by the time the second wave reaches the top therefore constructive interference
Forcemagnetic =Force Electric
BQv = QE
v = E/B = 6/2 = 3m/s